Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Returns a sidebar object, which contains several methods for registering add-ons with the browser.

Notes

The sidebar object returned has the following methods:

Method

Description (SeaMonkey)

Description (Firefox)

addPanel(title, contentURL, "")

Adds a sidebar panel.

Obsolete since Firefox 23 (only present in SeaMonkey).
End users can use the "load this bookmark in the sidebar" option instead. Also see Creating a Firefox sidebar.